title: Gene expression and activity of carbonic anhydrase in salinity stressed Penaeus monodon.
abstract: Carbonic anhydrase (CA) was identified by differential display PCR analysis as one of the differentially expressed genes in the gills of low salinity stressed (transferred from 25 to 3 ppt) Penaeusmonodon. To further characterize the role of CA in the regulation of salinity stress, the cDNA sequence of P.monodon carbonic anhydrase (PmCA) was attained by rapid amplification of cDNA ends and found to have a total length of 1194 bp. The deduced amino acid of PmCA shares 73% sequence identity with the CA homologue recently isolated from the crab, Callinectessapidus. Real time RT-PCR and enzymatic activity analyses were employed to determine the changes in the PmCA mRNA expression and total CA activity, respectively, after shrimps were transferred from 25 to 3 ppt salinities for up to 2 weeks. Compared to the CA level in the control group (25 ppt), PmCA mRNA was significantly increased in shrimp gills at 24 h after hypo-osmotic stress. In contrast, the epipodites and antennal gland displayed decreased levels of mRNA expression. The gross CA enzymatic activity after hypo-osmotic stress was increased in the shrimp gills but remained stable in the epipodites and antennal gland.
authors.affiliation: Shrimp Molecular Biology and Genomics Laboratory, Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok, 10330 Thailand.
authors.forename: Siriporn
authors.initials: S
authors.lastname: Pongsomboon
authors.forename: Suchonma
authors.initials: S
authors.lastname: Udomlertpreecha
authors.forename: Piti
authors.initials: P
authors.lastname: Amparyup
authors.forename: Suwit
authors.initials: S
authors.lastname: Wuthisuthimethavee
authors.forename: Anchalee
authors.initials: A
authors.lastname: Tassanakajon
mesh_terms: D000064:Acclimatization; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002256:Carbonic Anhydrases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D020869:Gene Expression Profiling / Q000379:methods; D015971:Gene Expression Regulation, Enzymologic; D005880:Gills / Q000201:enzymology*; D006801:Humans; D008969:Molecular Sequence Data; D033561:Penaeidae / Q000201:enzymology* / Q000235:genetics; D010802:Phylogeny; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000378:metabolism; D054712:Salinity; D016415:Sequence Alignment; D013312:Stress, Physiological; D014882:Water-Electrolyte Balance
chemical_list: D012333:RNA, Messenger; D002256:Carbonic Anhydrases